First, Sadun and her colleagues found a big difference in productivity based on how a CEO spent those additional hours.

首先，萨顿和她的同事们发现，CEO利用额外工作时间的方式不同，所获得的生产效率也存在较大差异。

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Granted, these were only working hours that the personal assistants knew about, and so, to a degree, "we don't get people who worked over the weekend or worked at home," says Sadun.

的确，这只是私人助理们所掌握的工作时间。萨顿说，“我们没有找到周末仍在工作，或者在家工作的例子。”

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Research was conducted by Nicholas Bloom of Stanford University, Rafaella Sadun of the Harvard Business School, and John Van Reenen of the London School of Economics.

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